diff --git a/scripts/rollup/rollup.config.js b/scripts/rollup/rollup.config.js
index c3c31b49..290490e5 100644
--- a/scripts/rollup/rollup.config.js
+++ b/scripts/rollup/rollup.config.js
@@ -23,7 +23,8 @@ if (!fs.existsSync(outDir)) {
 const outputResolve = (...p) => path.resolve(outDir, ...p);
 
 function genConfig(mode) {
-  const sourcemap = mode === 'development' ? 'inline' : false;
+  const isDev = mode === 'development';
+  const sourcemap = isDev ? 'inline' : false;
   return {
     input: path.resolve(libDir, 'index.ts'),
     output: [
@@ -53,7 +54,8 @@ function genConfig(mode) {
       replace({
         values: {
           'process.env.NODE_ENV': `"${mode}"`,
-          isDev: 'true',
+          isDev: isDev.toString(),
+          isTest: false,
           __VERSION__: `"${horizonVersion}"`,
         },
         preventAssignment: true,